<?php
  function filter_where( $where = '' ) {
    // posts in the last 30 days
    $where .= " AND post_date > '" . date('Y-m-d', strtotime('-2 days')) . "'";
    return $where;
}
add_filter( 'posts_where', 'filter_where' );

$my_query = new WP_Query( 'posts_per_page=2' ); //add some query parameter
if($my_query->have_posts()) :
while($my_query->have_posts()) :
$my_query->the_post();
the_title();
// and whatever you want to output
endwhile;
else : echo 'no post found';
endif;

remove_filter('posts_where', 'filter_where');
?>